In 1978, there were about 157 million vehicles (cars and trucks) and about 222 million people in the United States. The number of vehicles has been growing at 4% per year, while the population

has been growing at 1% per year. In what year was there, on average, one vehicle per person?

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

1/800 is the right answer